Oral Histology Exam: Trivia Quiz!

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  • 1/20 Questions

    Organization center that orchestrates surface morphogenesis is?

    • Enamel knot
    • Enamel chord
    • Enamel niche
    • Enamel mesh
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About This Quiz

Challenge your knowledge of oral histology with this engaging trivia quiz! Covering topics from mucous membrane thickness to dentinal tubule diameter, this quiz is perfect for dental students or professionals looking to test their understanding of dental anatomy and developmental stages.

Oral Histology Exam: Trivia Quiz! - Quiz

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  • 2. 

    Collagen found in pulp?

    • Type 1 and 3

    • Type 1 and 2

    • Type 1 and 4

    • Type 1 only

    Correct Answer
    A. Type 1 and 3
    Explanation
    Collagen is a protein found in various tissues of the body, including the pulp of teeth. Type 1 collagen is the most abundant type of collagen in the body and is found in the skin, bones, tendons, and other connective tissues. Type 3 collagen is commonly found in the walls of blood vessels, skin, and other organs. Therefore, the presence of both type 1 and 3 collagen in the pulp suggests that these types of collagen are involved in maintaining the structure and function of the dental pulp.

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  • 3. 

    Which of the following is indicative of ageing?

    • Expression of dead tracts

    • Widening of predentin

    • Increase in peritubular diameter

    • Increase in peritubular dentin

    Correct Answer
    A. Expression of dead tracts
    Explanation
    Expression of dead tracts is indicative of aging. Dead tracts are areas of dentin that have lost their vitality and become necrotic. As a person ages, the dentin in their teeth may start to deteriorate, leading to the formation of dead tracts. This can be caused by various factors such as tooth decay, trauma, or natural wear and tear over time. The presence of dead tracts is a sign of aging and can indicate potential dental problems that may need to be addressed.

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  • 4. 

    At what age is a child expected to have 12 erupted primary teeth and 12 erupted permanent teeth.

    • 4½ years

    • 6½ years

    • 8½ years

    • 12½ years

    Correct Answer
    A. 8½ years
    Explanation
    At around 8½ years of age, a child is expected to have 12 erupted primary teeth and 12 erupted permanent teeth. This is because by this age, most children have already lost their baby teeth and have started to grow their permanent teeth. The eruption of primary teeth usually begins around 6 months of age and is completed by around 2-3 years old. The eruption of permanent teeth typically starts around 6 years old and continues until the late teens or early twenties. Therefore, by 8½ years old, a child should have a mix of both primary and permanent teeth.

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  • 5. 

    What is the thickness of the layer of prismless enamel found in primary teeth?

    • 25 micron

    • 50 micron

    • 75 micron

    • 100 micron

    Correct Answer
    A. 25 micron
    Explanation
    The correct answer is 25 micron. The layer of prismless enamel found in primary teeth is 25 micron thick.

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  • 6. 

    Non-acidic, nonionic protein which helps in enamel mineralization.

    • Tuftelin

    • Sheathlin

    • Enamelin

    • Amelogenin

    Correct Answer
    A. Amelogenin
    Explanation
    Amelogenin is the correct answer because it is a non-acidic, nonionic protein that plays a crucial role in the mineralization of enamel. Enamel is the outermost layer of the tooth and its mineralization is essential for tooth strength and protection. Amelogenin helps in the formation and organization of enamel crystals, contributing to the development of a strong and durable enamel layer. Tuftelin, sheathlin, and enamelin are not involved in enamel mineralization, making them incorrect choices.

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  • 7. 

    The proliferation of the basal layer starts in which developmental stages?

    • Bud stage

    • Cap stage

    • Bell stage

    • Advanced bell stage

    Correct Answer
    A. Bud stage
    Explanation
    The proliferation of the basal layer starts in the bud stage. This stage is characterized by the formation of a small bud-like structure, which will eventually develop into the mature organ or structure. During the bud stage, the cells in the basal layer begin to divide rapidly, leading to the growth and development of the organ. This proliferation of cells in the basal layer is an important process in the early stages of development.

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  • 8. 

    At what stage of development of a tooth does dentinogenesis imperfecta occur:

    • Initiation

    • Proliferation

    • Histodifferentiation

    • Morphodifferentiation

    Correct Answer
    A. Histodifferentiation
    Explanation
    Dentinogenesis imperfecta is a genetic disorder that affects the development of dentin, the hard tissue in teeth. It is characterized by the abnormal formation of dentin, leading to weak and discolored teeth. Histodifferentiation is the stage of tooth development where the cells differentiate into specialized tissues, including dentin. Therefore, dentinogenesis imperfecta occurs during the histodifferentiation stage of tooth development.

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  • 9. 

    The average diameter of coronal dentinal tubules near pulp is?

    • 0.2-0.5 micron

    • 2-3 micron

    • 0.2-0.3 micron

    • 4-7 micron

    Correct Answer
    A. 2-3 micron
    Explanation
    The average diameter of coronal dentinal tubules near the pulp is 2-3 microns. Dentinal tubules are tiny channels that extend from the pulp to the outer surface of the tooth. They contain nerve fibers and are responsible for transmitting sensory stimuli. The diameter of these tubules can vary depending on their location within the tooth. In the coronal region, which is closer to the pulp, the average diameter is 2-3 microns. This size allows for the passage of nerve fibers and other substances between the pulp and the outer layers of the tooth.

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  • 10. 

    In which part of the oral cavity mucous membrane is the thinnest?

    • Soft palate

    • Labial mucosa

    • Floor of mouth

    • Buccal mucosa

    Correct Answer
    A. Floor of mouth
    Explanation
    The correct answer is "Floor of mouth." The floor of the mouth is the part of the oral cavity where the mucous membrane is the thinnest. The mucous membrane in this area is delicate and thin, allowing for easier movement and flexibility. This thinness is important for functions such as swallowing and speaking. In contrast, the soft palate, labial mucosa, and buccal mucosa have thicker mucous membranes to provide more protection and support.

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  • 11. 

    Membrana performativa is seen in:

    • Bell stage

    • Cap stage

    • Bud stage

    • Advanced bell stage

    Correct Answer
    A. Advanced bell stage
    Explanation
    The term "membrana performativa" is related to the development stages of teeth. During the advanced bell stage of tooth development, the enamel organ has a structure known as the membrana performativa. This stage is critical for the differentiation of cells that will form enamel, dentin, and the overall shape of the developing tooth.

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  • 12. 

    Blood vessels first appear in the papillae in:

    • Bud stage

    • Cap stage

    • Bell stage

    • Advanced bell stage

    Correct Answer
    A. Cap stage
    Explanation
    During the cap stage of development, blood vessels begin to form in the papillae. This is the stage where the tooth bud starts to differentiate into the different dental tissues, including the formation of the dental papilla. The dental papilla contains cells that will eventually differentiate into the dental pulp and blood vessels. Therefore, it is in the cap stage that the blood vessels first appear in the papillae.

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  • 13. 

    Atypical dentin is formed due to defect in

    • Apposition

    • Initiation

    • Histodifferentiation

    • Morphodifferentiation

    Correct Answer
    A. Histodifferentiation
    Explanation
    Atypical dentin is formed due to a defect in histodifferentiation. Histodifferentiation is the process by which cells differentiate into specific tissue types. In the case of dentin, histodifferentiation refers to the differentiation of dental papilla cells into odontoblasts, which are responsible for dentin formation. If there is a defect in this process, it can lead to the formation of atypical dentin, which may have abnormal characteristics or structure.

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  • 14. 

    Chronological hypoplasia is 

    • Hypoplasia of local origin

    • Hypoplasia of systemic origin

    • Hypoplasia of hereditary origin

    • None of the above

    Correct Answer
    A. Hypoplasia of systemic origin
    Explanation
    Chronological hypoplasia refers to a condition where there is underdevelopment or incomplete growth of a certain part of the body. In this case, it is specified that the hypoplasia is of systemic origin. This means that the underdevelopment is not limited to a specific local area but is instead affecting the entire system or body as a whole. It is not caused by hereditary factors or limited to a specific region, but rather has a systemic impact.

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  • 15. 

    The tactile threshold of the natural teeth during axial loading is?

    • 0.001-0.01N

    • 0.01-0.10N

    • 0.10-0.5N

    • 1.2N

    Correct Answer
    A. 0.01-0.10N
    Explanation
    During axial loading, the tactile threshold of the natural teeth refers to the minimum force that can be detected by the teeth. The correct answer, 0.01-0.10N, indicates that the tactile threshold falls within this range. This means that the natural teeth can sense forces between 0.01N and 0.10N during axial loading.

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  • 16. 

    Anchoring collagen?

    • 6

    • 7

    • 17

    • All

    Correct Answer
    A. 7
  • 17. 

    Sex determination is possible with which of the following protein?

    • Osteopontin

    • Tuftelin

    • Dentin sialoprotein

    • Amelogenin

    Correct Answer
    A. Amelogenin
    Explanation
    Amelogenin is the correct answer because it is a protein that plays a crucial role in tooth enamel formation. In addition to its dental functions, amelogenin has been found to be involved in sex determination. It is present in both males and females, but the difference lies in the size of the amelogenin gene. The gene has two copies, one on the X chromosome and one on the Y chromosome. The Y chromosome copy is shorter than the X chromosome copy, allowing for sex determination. Therefore, by analyzing the size difference of the amelogenin gene, the sex of an individual can be determined.

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  • 18. 

    Matrix vesicles are derived from?

    • Elastin fibres

    • Collagen

    • Osteoblast

    • Inflammatory cells

    Correct Answer
    A. Osteoblast
    Explanation
    Matrix vesicles are small extracellular vesicles that are released by osteoblasts, which are bone-forming cells. These vesicles play a crucial role in the initial mineralization of bone tissue. They contain various enzymes and calcium-binding proteins that are necessary for the deposition of calcium and phosphate ions, leading to the formation of hydroxyapatite crystals. Therefore, the correct answer is osteoblasts, as they are the source of matrix vesicles involved in bone mineralization.

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  • 19. 

    What percentage of dentin contains collagen?

    • 5%

    • 19%

    • 40%

    • 68%

    Correct Answer
    A. 19%
    Explanation
    Dentin is a calcified tissue that makes up the majority of a tooth's structure. It is composed of various components, including collagen. The correct answer, 19%, indicates that dentin contains 19% collagen. This suggests that collagen is a significant component of dentin, but it is not the majority.

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  • 20. 

    Blood vessels and nerves are generally scarce in which component of TMJ?

    • Anterior portion of disc

    • Articular disc

    • Posterior portion of disc

    • Central portion of disc

    Correct Answer
    A. Central portion of disc
    Explanation
    The central portion of the TMJ disc is generally scarce in blood vessels and nerves. This is because the central portion of the disc is primarily composed of fibrous tissue, which has a lower density of blood vessels and nerves compared to other tissues. The scarcity of blood vessels and nerves in this area may contribute to the limited ability of the disc to heal and regenerate in cases of injury or degeneration.

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  • Current Version
  • Aug 05, 2024
    Quiz Edited by
    ProProfs Editorial Team
  • May 02, 2018
    Quiz Created by
    Safeeravly
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